"If I won't be gay in the next life, maybe I'll just kill myself."

Let me summarize what the problems with President Packer's remarks were.

1. The logic that God wouldn't pre-set someone a certain way and not allow them to change it is faulty.  Every day children are born with mental and physical handicaps which they can't overcome.  You can't pray away Down Syndrome or AIDS.  I don't at all mean to cast being gay in a negative light by comparing it with disorders.  Also, and maybe I'm wrong about this, but I don't think God sends down temptations and challenges like Jove sends down lightening bolts.  He doesn't hurl one at a baby in the womb and say, "You shall be born with a missing toe!  Muahahaha!"  There are so many steps that are included in forming a child.
2. "Remember, He is our father."  So if God doesn't "pre-set" people that way, then that means it must be purely a temptation from Satan.  That really isn't a cheery thought, and that's not reassuring.  "It's not God's doing!  It's just Satan!  So you can overcome the temptation!"  Except when you can't and you can't change the way you feel.
3. Gay people already have a hard life cut out for them by being different from the accepted norm.  Add to that the pressure of being a teenager, and perhaps being misunderstood and not accepted by parents and friends ("You don't have to live with this problem!  You can change!  All the problems associated with it will go away."), and you can see why so many gay teens are depressed and suicidal.  Saying that homosexuality does not exist in the next life gives gay teens quite the reason to commit suicide.  If they try and try and can't change and "fail," then maybe death seems like a better option, especially if it is supposed to bring relief from same-sex attraction.  "If I won't be gay in the next life, maybe I'll just kill myself."
4. What you call "impure" and "unnatural," they call love.  Please show some tact and compassion.